// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_VERSION_H_
#define BASE_VERSION_H_
#pragma once

#include <string>
#include <vector>

#include "base/base_export.h"
#include "base/basictypes.h"
#include "base/gtest_prod_util.h"

// Version represents a dotted version number, like "1.2.3.4", supporting
// parsing and comparison.
class BASE_EXPORT Version {
  public:
    // The only thing you can legally do to a default constructed
    // Version object is assign to it.
    Version();

    ~Version();

    // Initializes from a decimal dotted version number, like "0.1.1".
    // Each component is limited to a uint16. Call IsValid() to learn
    // the outcome.
    explicit Version(const std::string& version_str);

    // Returns true if the object contains a valid version number.
    bool IsValid() const;

    // Commonly used pattern. Given a valid version object, compare if a 
    // |version_str| results in a newer version. Returns true if the
    // string represents valid version and if the version is greater than
    // than the version of this object.
    bool IsOlderThan(const std::string& version_str) const;

    // Returns NULL if the string is not in the proper format.
    // Caller is responsible for freeing the Version object once done.
    // DO NOT USE FOR NEWER CODE.
    static Version* GetVersionFromString(const std::string& version_str);

    // Creates a copy of this version object. Caller takes ownership.
    // DO NOT USE FOR NEWER CODE.
    Version* Clone() const;

    bool Equals(const Version& other) const;

    // Returns -1, 0, 1 for <, ==, >.
    int CompareTo(const Version& other) const;

    // Return the string representation of this version.
    const std::string GetString() const;

    const std::vector<uint16>& components() const { return components_; }

  private:
    std::vector<uint16> components_;
};

#endif  // BASE_VERSION_H_
